create a udp client on a specific port in rust

To create a UDP client in Rust that communicates over a specific port, you can use the std::net::UdpSocket module. Here's an example code snippet that sends a message to an address on a specified port:

main.rs
use std::net::UdpSocket;

fn main() -> std::io::Result<()> {
    let socket = UdpSocket::bind("0.0.0.0:12345")?;
    let addr = "127.0.0.1:43210";
    let buf = b"hello, world!";
    socket.send_to(buf, &addr)?;
    Ok(())
}
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In the main() function, we first create a new UdpSocket by binding it to the local address "0.0.0.0" and a specific port number "12345". This port number can be any available port on your machine that is not already being used by another process.

Next, we define the address of the UDP server we want to send a message to in the addr variable. This is a string that contains both the IP address and the port number of the server, separated by a colon. In this example, we are using the loopback address 127.0.0.1 and the port number 43210.

Finally, we define the message we want to send in the buf variable, and call the send_to() method on the UDP socket, passing in the buffer and the address we want to send the message to. If the message is successfully sent, the method will return a Result<(), std::io::Error> object with an Ok() result.